Table of Contents
Advertisement
resv-cbs
Syntax
resv-cbs percent-or-default amber-alarm-action step percent max [1..100]
resv-cbs percent-or-default
no resv-cbs
Context
config>port>access>egress>pool
config>port>ethernet>network
config>card>mda>access>egress
config>card>mda>access>ingress
config>card>mda>network>egress
config>card>mda>network>ingress
config>port>access>egress>channel>pool
config>port>access>ingress>pool
config>port>network>egress>pool
Description
This command defines the percentage or specifies the sum of the pool buffers that are used as a guideline for
CBS calculations for access and network ingress and egress queues. Two actions are accomplished by this
command.
• A reference point is established to compare the currently assigned (provisioned) total CBS with the
amount the buffer pool considers to be reserved. Based on the percentage of the pool reserved that has
been provisioned, the over provisioning factor can be calculated.
• The size of the shared portion of the buffer pool is indirectly established. The shared size is important
to the calculation of the instantaneous-shared-buffer-utilization and the average-shared-buffer-utiliza-
tion variables used in Random Early Detection (RED) per packet slope plotting.
It is important to note that this command does not actually set aside buffers within the buffer pool for CBS
reservation. The CBS value per queue only determines the point at which enqueuing packets are subject to a
RED slope. Oversubscription of CBS could result in a queue operating within its CBS size and still not able
to enqueue a packet due to unavailable buffers. The resv-cbs parameter can be changed at any time.
If the total pool size is 10 MB and the resv-cbs set to 5, the 'reserved size' is 500 KB.
The no form of this command restores the default value.
The no resv-cbs command will clear all the adaptive configurations. There cannot be any adaptive sizing
enabled for default resv-cbs.
Default
default (30%)
Parameters
percent-or-default — Specifies the pool buffer size percentage.
Values
amber-alarm-action step percent — specifies the percentage step-size for the reserved CBS size of the
pool. When using the default value, the adaptive CBS sizing is disabled. To enable adaptive CBS sizing,
step percent must be set to non-default value along with the max parameter. When reserved CBS is
default adaptive CBS sizing cannot be enabled. The reserved CBS (Committed Burst Size) defines the
amount of buffer space within the pool that is not considered shared.
Values
Default
7710 SR OS Interface Configuration Guide
0 — 100, default
1 — 100
0
Interface Configuration
Page 181
Advertisement
Table of Contents
